{"id":"USN-7874-3","summary":"linux-iot vulnerabilities","details":"Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered\nthat the Linux kernel contained insufficient branch predictor isolation\nbetween a guest and a userspace hypervisor for certain processors. This\nflaw is known as VMSCAPE. An attacker in a guest VM could possibly use this\nto expose sensitive information from the host OS. (CVE-2025-40300)\n\nSeveral security issues were discovered in the Linux kernel.\nAn attacker could possibly use these to compromise the system.\nThis update corrects flaws in the following subsystems:\n  - HSI subsystem;\n  - I3C subsystem;\n  - SMB network file system;\n  - Padata parallel execution mechanism;\n  - Timer subsystem;\n  - Networking core;\n(CVE-2023-52854, CVE-2024-35867, CVE-2024-50061, CVE-2024-56664,\nCVE-2025-21727, CVE-2025-37838, CVE-2025-38352)\n","modified":"2026-02-10T04:50:22Z","published":"2025-12-04T17:49:28Z","related":["UBUNTU-CVE-2023-52854","UBUNTU-CVE-2024-35867","UBUNTU-CVE-2024-50061","UBUNTU-CVE-2024-56664","UBUNTU-CVE-2025-21727","UBUNTU-CVE-2025-37838","UBUNTU-CVE-2025-38352","UBUNTU-CVE-2025-40300"],"upstream":["CVE-2023-52854","CVE-2024-35867","CVE-2024-50061","CVE-2024-56664","CVE-2025-21727","CVE-2025-37838","CVE-2025-38352","CVE-2025-40300","UBUNTU-CVE-2023-52854","UBUNTU-CVE-2024-35867","UBUNTU-CVE-2024-50061","UBUNTU-CVE-2024-56664","UBUNTU-CVE-2025-21727","UBUNTU-CVE-2025-37838","UBUNTU-CVE-2025-38352","UBUNTU-CVE-2025-40300"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7874-3"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-52854"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2024-35867"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2024-50061"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2024-56664"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-21727"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-37838"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-38352"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-40300"}],"affected":[{"package":{"name":"linux-iot","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/linux-iot@5.4.0-1056.59?arch=source&distro=esm-infra/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.0-1056.59"}]}],"versions":["5.4.0-1001.3","5.4.0-1004.6","5.4.0-1005.7","5.4.0-1006.8","5.4.0-1009.11","5.4.0-1010.12","5.4.0-1011.13","5.4.0-1012.14","5.4.0-1013.15","5.4.0-1014.16","5.4.0-1017.18","5.4.0-1018.19","5.4.0-1019.20","5.4.0-1021.22","5.4.0-1022.23","5.4.0-1023.24","5.4.0-1024.25","5.4.0-1025.26","5.4.0-1026.27","5.4.0-1028.29","5.4.0-1029.30","5.4.0-1030.31","5.4.0-1031.32","5.4.0-1032.33","5.4.0-1033.34","5.4.0-1034.35","5.4.0-1035.36","5.4.0-1036.37","5.4.0-1037.38","5.4.0-1038.39","5.4.0-1039.40","5.4.0-1040.41","5.4.0-1041.42","5.4.0-1042.43","5.4.0-1043.44","5.4.0-1044.45","5.4.0-1045.46","5.4.0-1048.51","5.4.0-1049.52","5.4.0-1051.54","5.4.0-1052.55","5.4.0-1053.56","5.4.0-1054.57","5.4.0-1055.58"],"ecosystem_specific":{"binaries":[{"binary_version":"5.4.0-1056.59","binary_name":"linux-buildinfo-5.4.0-1056-iot"},{"binary_version":"5.4.0-1056.59","binary_name":"linux-headers-5.4.0-1056-iot"},{"binary_version":"5.4.0-1056.59","binary_name":"linux-image-unsigned-5.4.0-1056-iot"},{"binary_version":"5.4.0-1056.59","binary_name":"linux-iot-headers-5.4.0-1056"},{"binary_version":"5.4.0-1056.59","binary_name":"linux-iot-tools-5.4.0-1056"},{"binary_version":"5.4.0-1056.59","binary_name":"linux-modules-5.4.0-1056-iot"},{"binary_version":"5.4.0-1056.59","binary_name":"linux-tools-5.4.0-1056-iot"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7874-3.json","cves_map":{"cves":[{"id":"CVE-2023-52854","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2024-35867","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2024-50061","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2024-56664","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2025-21727","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"high","type":"Ubuntu"}]},{"id":"CVE-2025-37838","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2025-38352","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"high","type":"Ubuntu"}]},{"id":"CVE-2025-40300","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"high","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:20.04:LTS"}}}],"schema_version":"1.7.3"}